Thy word have I hid in mine heart, that I might not sin against thee.
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Psalms 119:9-13
Other Bible passages linked to this one, most cited first.
The law of his God is in his heart; none of his steps shall slide.
Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
I delight to do thy will, O my God: yea, thy law is within my heart.
Thy words were found, and I did eat them; and thy word was unto me the joy and rejoicing of mine heart: for I am called by thy name, O LORD God of hosts.
But his delight is in the law of the LORD; and in his law doth he meditate day and night.
Receive, I pray thee, the law from his mouth, and lay up his words in thine heart.
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.